SpringBoot+mail 轻松实现各类邮件自动推送

在Spring Boot中实现邮件自动推送功能，你可以使用spring-boot-starter-mail库。以下是一个简单的例子，展示了如何配置邮件服务器并发送一封简单邮件。

1. 添加依赖到你的pom.xml：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-mail</artifactId>
</dependency>

2. 在application.properties或application.yml中配置你的邮件服务器：

spring.mail.host=smtp.example.com
spring.mail.port=587
spring.mail.username=your_username
spring.mail.password=your_password
spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true

3. 创建一个MailService来发送邮件：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.SimpleMailMessage;
 
@Service
public class MailService {
 
    private final JavaMailSender mailSender;
 
    @Autowired
    public MailService(JavaMailSender mailSender) {
        this.mailSender = mailSender;
    }
 
    public void sendSimpleMail(String to, String subject, String text) {
        SimpleMailMessage message = new SimpleMailMessage();
        message.setTo(to);
        message.setSubject(subject);
        message.setText(text);
 
        mailSender.send(message);
    }
}

4. 在你的应用中使用MailService来发送邮件：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
 
@RestController
public class MailController {
 
    private final MailService mailService;
 
    @Autowired
    public MailController(MailService mailService) {
        this.mailService = mailService;
    }
 
    @GetMapping("/sendMail")
    public String sendMail() {
        mailService.sendSimpleMail("recipient@example.com", "Test Subject", "This is the email content");
        return "Mail sent!";
    }
}

确保你的应用配置了正确的邮件服务器信息，并且sendMail端点可以被调用来发送邮件。这个例子展示了如何发送文本邮件，如果你需要发送HTML邮件或者附件，你可以使用MimeMessageHelper来扩展SimpleMailMessage。